How to: GM12SI alternator on a small block

hey, so that top bracket (with 3 holes) needs to be flat to get the pully to line up??
how long is that spacer (that alt piviots on)
im doin this to my duster, im tired of nothin at idle!!
thanx

You take the top bracket and turn it around...it usually bends closer to the block where the alternator bolt is, When you turn it around, it will no longer bolt to the lower of the 2 water pump bolts, so you have to slice it for it to look right like I show in the picture.

if you take the stock long alternator spacer and add ~3/8" to it (I used a nut that is one size larger than the bolt), It will fit perfect. Remember you need to take a 6" bolt and cut it down to around 5.5" of length.